How can I link back to my website on my WordPress blog?

How can I change the "About my company" link (that currently opens up a section of my WordPress blog that describes my company) to instead redirect users to my external website? If that can't be done, can I add a button anywhere on my blog that gets people to visit my company website, or add a link to my logo, so that when people click the image they get redirected to my webpage? My webpage has a link to the WordPress blog already, I'm just looking to reciprocate, and have an easy-to-see-and-use link right on the blog homepage that brings users back to the website.